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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08343913374f99c033cacebbb6a342f2f657e5b4321e6f827c7b20043e08e799' 
  AND token = 'v3faucZP924QisYXtgrGV2l/zlf0xSvq6+0/cKxghvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}